Key facts
- Brand
- Agilent
- Model
- D4815
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-02
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Running ASTM Method D4815 for Determining Oxygenates in Gasoline on the Agilent 6820 GC Application Note
The document details a method for determining oxygenates, including methyl tert-butylether (MTBE), ethyl tert-butylether (ETBE), and various alcohols, in unleaded gasoline. The procedure utilizes the Agilent 6820 Gas Chromatography (GC) system equipped with a flame ionization detector (FID), a 10-port switch valve, and two specific columns: a polar TCEP micropacked column for prefractionation and a nonpolar HP-1 capillary column for separation.
The application outlines the experimental configuration, including hardware components like the auxiliary gas pressure regulator and software used (Cerity NDS). It provides specific instrument conditions such as oven programs, flow rates, and temperatures. The text also explains the method description involving valve switching to separate lighter hydrocarbons from oxygenates, presents calibration procedures with standards, and discusses results regarding repeatability which exceeds ASTM D4815 specifications.
Agilent D4815 specifications
| System Type | Agilent 6820 GC system |
|---|---|
| Prefraction Column | Micropacked column packed with polar 1,2,3-tris-2-cyanoethoxypropane (TECP) |
| Analytic Column | Nonpolar HP-1 capillary column |
| Internal Standard | 1,2-dimethoxyethane (DME) |
| Inlet Temperature | 200 °C |
| Detector Temperature | 250 °C |
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Questions answered in these manuals
What compounds are determined by this method?
The specific compounds determined include methyl tert-butylether (MTBE), ethyl tert-butylether (ETBE), tert-amylmethylether (TAME), diisopropylether (DIPE), and various alcohols such as methanol, ethanol, and propanol.
What is the recommended backflush time for analyzing DIPE?
For this system, a backflush time of 0.22 minutes is used for the analysis of DIPE to ensure hydrocarbons are completely eluted while ethers are retained.